i have my subs, 1250rms 3000peek watts each, all connected to pretty inexpensive single outlet surge protectors and have not noticed any difference since i did this. not that i have spent my time "testing" for spl, etc. but i have played material using the surges and while not and i could tell no difference. i dont think my homeowners rate would stay the same if i ever filed a claim for all my subs, so im going to stick with surge suppression. they make different varieties that can be connected to your box or out on the road....